Set an admin password (please set an extremely strong password)
Once you're in the Portainer Dashboard, you'll want to go to Containers to check on their state. Notice the Quick Actions column as well.
The Quick Actions column allows you to view the logs of a particular container/service in realtime.
From Quick Actions, you can also view how much RAM and CPU a particular container is using.
If you need to access a container's terminal, such as when creating a user for Dante, you can do so from the container console.
You can also click on the container name and access the Logs, Stats, and Console from there.
The Images page allows you to remove an unused Docker image, or upgrade an existing image.
The Volumes page gives you a list of the persistent storage that the containers are using. Persistent storage means that the data is retained even after a container is removed or recreated.
For instance, if you create a Server or a User from the Pritunl web panel, the data is stored in the underpass_mongodb volume. You can remove or delete the pritunl or mongodb container all you want, but your login credentials, users, and VPN servers will remain intact. However, if you delete the underpass_mongodb volume, all your data is lost as well.
The Volumes page also allows you to see the exact location of the volumes on the Docker host. If you want to make a backup of your persistent storage, you can find them in /var/lib/docker/volumes.